The Programmable Voice Conference REST API now supports a new CallerId Parameter with Conference Create Participant REST API. This change allows developers to set the CallerId to a different phone number from the one used for the identity of the call in the From parameter. Prior to this change, the phone number in the From parameter was the Caller Id displayed on the end device, as well as the identifier used by carriers to calculate charges for that call. This change is specifically important for outbound dialing in European destinations where you could take advantage of Origin-Based Pricing for lower rates.
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Please note that the phone number used in both the CallerId and From number must be a Twilio verified Phone number